the fbi is investigating. one agent died and another was injured when they were responding to a border sensor. they are waiting for results on tests for shell casings. and gas prices are soaring to shocking levels in california. a number of stations have even been forced to shut down. they sold out of their gas and are waiting to reopen when they can buy it at cheaper prices. the price has hit $4.48. the price spike is being blaminged on a refiery fire. and scientists are studying an amazing find from the russian tundra. a woolly mammouth. scientists labored for five days, and the mammouth is being named after the boy that found it. there are wears that used to be covered in ice, but now because of global warming their thawing out and their finding some amazing things. 30,000 years old is what it's estimated to be. >> lisa, thank you. the united states military is preparing for possible trouble with iran with the economic sanctions don't work. tom foerman is in tonight for erin burnett. what's going on? >> the